For several years I've had an issue with my battery discharging overnight. I park it in the evening and by morning the battery is flat.

I've installed a charger in my garage and can plug it in when not in use but this is hardly a solution.

I keep on testing by isolating my aftermarket circuits to see if it makes a difference but nothing conclusive. And I've tested the standing draw and it's about 32milli-amps (same as another S2000).

One thing I have noticed occasionally is an electrical buzzing that starts intermittently. I expect it is this that is discharging my battery.

A friend has suggested the ABS pump may be sticking on and pressurising the system. Anyone know what relay controls this system?

Also, does the fuel tank have an electric pump that pressurises it? I'm wondering of this is the buzzing noise.

Any other suggestions would be greatly appreciated.

 

On other makes/models, a bad starter solenoid can cause a similar issue (mysterious discharging of the battery). I've never heard of it happening with Honda, but I suppose it's possible.

 

AusS2000 Posted on Sep 18 2007, 03:15 PM
Was that with the doors unlocked or locked?
I mean, did you test it as you park it?
Maybe an alarm system kicking in after a 10 seconds or so?

The ABS pump is fuse #50/30Amps but that's in my left hand drive car.
Fuel pump is fuse #2/15Amps (same comment as above).

 

Have to replace my ABS modulator anyway as it got a bit melted by my turbo.

I think I'll test it by isolating each circuit and seeing which one makes a difference.

 

Trunk light on? It's silly, I know. But I'm sure you'd just like to find the problem.

If the switch telling the trunk that it's closed is broken, then it might intermittently stay on.

 

No, it's a good suggestion. Makes me think of the problem of seeing of the fridge light stays on.

But what I can do is check it from behind the passenger seat. Or disconnect it and see if it makes a difference.

Thanks.

 

Any aftermarket alarm, cruise control added?

Otherwise It's time to start pulling fuses with an ammeter hooked up till the load goes away.